Ventromma halecioides (Alder, 1859) Materials Type status: Other material. Location: locality: La Concha; minimumDepthInMeters: 0.5; maximumDepthInMeters: 1.0; Event: year: 2021; month: 6; day: 19; habitat: all macroalgae regions; Record Level: dataGeneralizations: 18 ° C; 36 PSU Type status: Other material. Location: locality: La Concha; minimumDepthInMeters: 0.5; maximumDepthInMeters: 1.0; Event: year: 2022; month: 2; day: 11; habitat: all macroalgae regions; Record Level: dataGeneralizations: 18 ° C; 36 PSU Notes Fig. 6 b Type locality. Cullercoats and Roker, England (Alder 1859). Detailed description in Calder (1997), Peña-Cantero and García-Carrascosa (2002), Mendoza-Becerril et al. (2020). Taxonomic status. Unaccepted (see Fig. 6 b remarks). AphiaID 117678. Remarks. Recent molecular studies support the validity of species with sufficient genetic divergence from Kirchenpaueria, forming a sister clade to the rest of the family Kirchenpaueriidae (Peña-Cantero et al. 2010, Maronna et al. 2016, Moura et al. 2018). Therefore, we follow this genetic evidence and the presence of bithalamic nematothecae (c. f. Calder 1997), we consider our specimens to belong to V. halecioides. Diagnosis Colony erect, with creeping hydrorhiza. Hydrocaulus branched, monosiphonic, divided at regular intervals into internodes, each with one distal nematotheca and one hydrocladial apophysis. Exoskeleton with a visible layer corresponding to perisarc. Hydrocladia alternate, unbranched, with up to four thecate internodes. Thecate internodes with a distal hydrotheca, a median inferior nematotheca and a median superior nematothecae. Hydrotheca cup-shaped with margin entire. Without gonothecae.

Published as part of Mendoza-Becerril, María A., Murillo-Torres, Paulina, Serviere-Zaragoza, Elisa, León-Cisneros, Karla, Mazariegos-Villarreal, Alejandra, López-Vivas, Juan Manuel & Agüero, José, 2024, First records of hydroid epibionts on the introduced macroalga Gracilaria parvispora in the Mexican Pacific, pp. e 130248 in Biodiversity Data Journal 12 on page e130248, DOI: 10.3897/BDJ.12.e130248